HOUSTON (Reuters) - Venezuela's supply of heavy crude to U.S. independent refiner Phillips 66 has dropped by more than two-thirds this year in part due to quality problems, and the company has cancelled at least one cargo in recent months, according to...

HOUSTON (Reuters) - Venezuela's supply of heavy crude to U.S. independent refiner Phillips 66 has dropped by more than two-thirds this year in part due to quality problems, and the company has cancelled at least one cargo in recent months, according to sources from state-run oil company PDVSA.